Acars Via Iridium

ACARS via Iridium Iridium is a extensive satellite constellation that consists of 66 low-earth orbiting (LEO), cross-linked satellites operating as a fully meshed network providing sincerely yours global c overage (including oceans, airways and polar regions). Iridium satellites are in a near-polar orbit at an overhead railway of 485 miles. The network is composed of 66 active satellites that fly in six orbital planes, each with 11 satellites per plane. Satellites circle the earth once every 100 minutes. ACARS is an Aircraft Communication Addressing and Reporting System otherwise cognise as Digital infoLink System.ACARS was first developed in the 1970s. It is a point-to-point service that either sends air-to-ground messages or receives ground-to-air messages from the cockpit. ACARS via Iridium direct gives Flight Departments the capability to communicate with the aircraft in their fleet all over the globe. ACARS is now a viable option via Iridium. Until now ACARS was provided available by 2 different mediums. ACARS via real High Frequency (VHF) communication is only available through line of site.ACARS via Inmarsat (Satcom) is only available over the populated continents and does not provide communications over polar routes. The cost of Iridium service is farthermost less than that of Satcom and is available over oceans whereas VHF is not. This allows aircraft to access various services provided by ACARS Service Providers. Aircraft dismissful now send a number of automatic reports (OOOI, engine oil pressure, position reports, fuel, and etc) using ACARS via Iridium. Pilots can request relevant information pertaining to flight safety and receive necessary in-flight updates.Some of the entropy services let in Text-based and Graphical Weather, Flight Planning and Clearances, Text Messaging, Position Reporting, Automatic endpoint Information Services (ATIS), Terminal Weather Information for Pilots (TWIP), and OOOI messages (Out of the gate, Off the grou nd, On the ground, and Into the gate). New flight safety services such as interpretler Pilot entropy Link Communications (CPDLC) and Future Air Navigation System pass on (FANS) are currently undergoing live tests to help improve flight times and routes for Air Transportation.Typical ACARS messages are only 100 to 200 characters in length. Such messages are made up of a one- hitch transmission from (or to) the aircraft, cumber to be no more than 220 characters within the body of the message. Iridiums Short Burst Data Service (SBD) has the network transport capability to transmit short data messages between field equipment and a centralized host computing system. ACARS pig outs are 238 bytes maximum segmenting and distributing them across multiple SBD messages is not necessary. Each ACARS block is encapsulated in a unique SBD message.ACARS requires ARINC-429 Interface, compliant with ARINC 741 characteristics for satellite communication systems. Standardized nature of the ARINC 4 29 digital data bus allows Satcom Data Unit (SDU) to interface with wide variety of ACARS capable hardware. Air-to-ground messages are originated from the Control Display Unit (CDU), which is located in the cockpit of the aircraft. The pilot will initiate his request through the CDU, where the Data Management Unit (DMU) will pass the ACARS requested message onto the Iridium Satcom Data Unit (SDU).The SDU encapsulates each ACARS block into an SBD message and sends the SBD message to the Iridium gateway. The SBD messages are received by the Iridium gateway, converted patronise into ACARS blocks, then passed on to the chosen DataLink Service Provider (DSP) through the service supplier gateway. Conversely, ground-to-air messages from the data provider are passed through the service provider gateway as ACARS message blocks. Once received by the Iridium gateway, they are encapsulated as SBD messages and delivered to the aircraft.Once the SDU has received an uplink SBD message, it remove s SBD-specific information and passes the remaining data to the DMU as an ACARS message block via the ARINC 429 data bus. The DMU then interprets and displays the ACARS data via the CDU. ARINC (Aeronautical Radio, Incorporated) and SITA (Society of International Telecommunications Aeronautics) are the two DSPs available to the airlines. ACARS messaging allows the airlines to identify perverted flight conditions and automatically send real-time messages to an airline, thereby enabling airlines to improve their aircraft performance.